WM8941GEFL/V

Overview

The WM8941GEFL/V is a low-power mono audio CODEC designed for portable applications such as digital still cameras and camcorders. It integrates a high-quality ADC and DAC with an on-chip speaker driver and video buffer. The device supports audio sample rates from 8 kHz to 48 kHz, offering a typical DAC SNR of 98 dB and ADC SNR of 91 dB. It operates with analogue supply voltages between 2.5 V and 3.6 V, while digital supplies can range down to 1.71 V. The component is housed in a compact 28-lead QFN package measuring 4x4 mm.

Feature Summary

• Integrates a current-mode video buffer with programmable gain and sync-tip clamp for direct TV connectivity.
• Includes a BTL speaker driver capable of delivering up to 0.4 W into an 8 Ω load.
• Features advanced digital filtering with four fully-programmable notch filters and a selectable high-pass filter for noise reduction.
• Supports differential or single-ended microphone inputs with integrated preamplifiers and automatic level control.

Applications

• Digital still cameras
• Camcorders
• General purpose mono audio CODEC with video buffer

Procurement Notes

Verify the specific ordering suffix against the manufacturer's documentation to confirm packaging details. The 'V' suffix indicates a tube package, whereas the 'RV' suffix denotes tape and reel packaging. Confirm that the required moisture sensitivity level and reflow soldering temperatures align with your assembly process specifications before procurement.

Selection Notes

Select this component when a mono audio solution with integrated video output is required for space-constrained portable devices. Ensure the system design accommodates the separate analogue and digital supply rails, as the digital core can operate at lower voltages than the analogue sections to optimize power consumption during idle or low-load states.

Part Context

The WM8941 belongs to the Wolfson Microelectronics (now Cirrus Logic) portfolio of portable audio codecs. It is specifically engineered to combine high-fidelity audio processing with video signal buffering in a single small form factor. This integration reduces the external component count compared to discrete solutions, making it suitable for compact consumer electronics where board area is limited.

Replacement Considerations

The WM8941GEFL/RV is functionally equivalent but supplied in tape and reel packaging instead of tubes. Verify pin compatibility and register maps if substituting with other mono CODECs from the same family, as feature sets may vary regarding video buffer integration or output drive capabilities.

FAQ

What is the maximum output power of the integrated speaker driver?

The integrated speaker driver can deliver 0.4 W into an 8 Ω load using bridge-tied load (BTL) configuration.

Does the WM8941 support both differential and single-ended microphone inputs?

Yes, the device includes a microphone interface that supports both differential and single-ended connections with programmable gain.

What is the purpose of the integrated video buffer?

The video buffer provides direct connectivity to a television by handling signal reconstruction, including a third-order input low-pass filter and sync-tip clamp, with programmable gain.